Previously, if no tonberry.db existed on the SD card, the database was
initialized with a playlist for each directory containing mp3 files,
with the tag serial number matching the directory name. This was used
during development before the web UI to edit the playlist db existed.
It is no longer necessary, and confusing to the user when unusable
playlists are created when albums are preloaded onto the SD card before
putting it in the tonberry device.
Signed-off-by: Matthias Blankertz <matthias@blankertz.org>